import { ErrorRequestHandler, NextFunction, Request, Response } from 'express';
export declare type AsyncRequestHandler<R = unknown> = (req: Request, res: Response, next: NextFunction) => Promise<R>;
/**
 * Wraps an async handler in a promise and on catch sends it to the error handler, or next if there is none given
 *
 * @example
 *
 *   app.get('path', asyncHandler(async function(req, res, next) {
 *     // ...
 *   }))
 *
 * @param handler
 * @param errorHandler
 */
export declare function asyncHandler<R = unknown>(handler: AsyncRequestHandler<R>, errorHandler?: ErrorRequestHandler): (req: Request, res: Response, next: NextFunction) => void;